bradshaw



G. E. BRADSHAW.

ROLLER BEARING.

APPLICATION FILED APR. II, 1918. 133241338. Patented Dec. 9,1919.

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G. E. BRADSHAW.

ROLLER BEARING.

APPLICAIION FILED APR H, l9l8. 1,824,638. Patented Dec. 9,1919.

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Z /r 4 a; 5/ Z is hardenedby any suitable process on the V UNITED STATES PATENT OFFICE. I

GRANVILLE E m Q01 BRADSHAW, or warroiv-ou-flrnanns, ENGLAND; I

Roman-BEARING.

To all whom it may concern:

Be it known that I, GRANVILLE EAs'rwooD' BRADSHAW, a subject of the King of Great Britain and Ireland, of A. B. C. Motor Works, Hersham, Walton-on-Thames, in

the county of Surrey, England, have invent ed new and useful Improvements in Rol1er- Bearings, of which the followingis a specification.' v V My inventlon relates to lmprovements 1n roller and ball races for use on machinery in general, and especially internal combustion engines and the like; v

. The rincipal object of this invention is to obtain aroller or ball race which is light and strong, adaptable to various parts of such parts in the machinery to which they are applied; I

Made according to my invention, the race track of the rollers or balls and it may be fitted with a rib or flange or other device,

for the pur ose of attaching it adequately to any mem er. This rib or flange or other part which is integral with it, may be left,

soft inknown manner, such-as by electroplating before carbonizing, or by leaving an excess of metal initially and machining it off before plunging when hardening, or

any knownpractice may be utilized.- This rib or flange or integral part may bedrilled or otherwlse adapted to be bolted or attached rigidly to any suitable mount, or 11'; may be formed integral with a gear wheel of any known design, or it may form the shank of a connecting rod in which the big end constitutes the 'outer race of the roller or ball'bearing, which outer race may be integral with'the connectin rod, and which may be hardened either in t e big end alone, or in any part desired, and may :be left soft in the shank of the rod so as to enable it better to withstand shocks and vibrations without fracture, as would often. occur if Specification of Letters Patent.

the whole of the rod were hardened. This fracture would be due to a hardened part being more brittle than an unhardened part. Another advantage of my invention is as follows. In ordinary roller-bearings, any overload that may occur often tends to chipthe corners of the rollers, particularly if there is any. increased pressure on -the cornersdue to an inaccuracy of thev Patented Dec. 9, 1919.

Application filed April 11, 1918. Serial No. 228,005.

races; 'but in my'invention, 'I' place the web approximately in line with the center of the roller. This .I have found has decreased the pressure on the corners of the rollers, due to the outer race being less rigid where it is in contact with the corners, thus allowing a very slight springto take place. The amount of this spring is almost infinitesimally small, and yet I have v i foundit sufficient to chipping.

prevent the roller from:

-Reference will hereinafter be made to the accompanying drawings showing typi-- cal examples of my said invention in certain forms, 1

Figures 1 to 4 be1ng v1ews 1n cross secsimilar bearings;

-, tion of the outer races of certain somewhat Figs. 5,6 and 7 views of a connecting rod 1' big? end in position upon a crank pin;

ig. 8 showing a modified form of outer race in conjunction with a shaft;

Fig. 9a a gear wheel integral with the outer race combined with an overhung shaft;

' Fig. 10 'an example of my invention ap plied to an inner race, and

Fig-11 a variation for "use with a gear shaft, both fully described hereinafter.

The same letters of.reference denote the ures.

One

race A' to slide easily intoposition upon the rollers. The flange O is left soft, or is- Y I hardened on any part where hardness may be necessary, and it is provided with holes 0, through which bolts, riv'ets or. screws are. passed" by which its spigot e is secured in the crank easel) part.

In Fig. 2, is shown similar aa. with a 1i on each side (or on oneside only, if sired) separated from the track a. -by

or anyothersuitable I asame or simllar, parts in. the respect1ve fi-ga small recess (2', which facilitates the'workof machining and grinding the face a. The

lips B are hardened as at a, upon their in ner surfaces. The flange C may be drilled with holes 0 and inserted into. a part 1), as in Fig.1. i

Fig. 3 shows a similar outer raceto Fig. 2', but in this case, it is in .two pieces or halves A A' divideddown the center of their flanges C. C" for the purpose of assembling, and in order-to -maintain aline- "I ment of the two halves of this race the edge of the smaller flange C fitting-into the to form a seating for it.

Fig. illustrates a f'urther modification of this outer race, and may have a completely hardened ring E and forming the inner race, and one or two flanges C which other flange C, 'as at) which is rabbeted may be hardened in any desired place, in

the manner above referred to. This race is adapted to be fastened on to a flange or web D with holes in it for rivets or other clampin means, and each half A A, (or

one of them) may be formed with a seat e at the base of the flanges C C.

Instead of the flanges C or-C in Figs.

' 1, 2, 3 and 4, any alternative means may be adopted for rigidly carrying this outer race in the crank casing or other part that is desired. But when theseouter races have to be carried direct in aluminium, which is a soft metal, the flanges and bolt holes mentioned are preferable, and it is further preferable to have anges and spigots soft on the surfaces that are in contact with the aluminium, as I have found that this gives a better hold on tothe aluminium-and pre:

ventsthe aluminium being so hammered as to make the outer race a loose fit, which frequently occurs when the outer race is hardened on the outside andpushed into the soft aluminium, as is usual.

Fig. 5 shows this invention applied to a connecting rod big end bearing. F .is the shalik of the rod which may be of H section as shown, or any other known section,. and may be kept soft as already described. A is the. big end outer race which is integral with the connecting rod, and, may be hardenedon the faces a a.

G G are split collars of the kind described in my previous Patent No.

24190/14,issued in Great Britain and this,

' only on the required if desired, may be hardened only on the face in contact with some working part. Hv

is'the crank pin which may be hardened I place in the manner above described, and K K are rollers. The split collars Gmay be drilled with holes such as g for the pur pose of lubrication.

Fig. 6 indicates a similar connectin rod big end hearing, but the' crank pin is fitted with ribs hwhich areintegral with the crank pm, and may be hardened'on the J is the crank web.v

sides in contact with the rollers K and left soft on the sides in contact with tlie split.

collars G. In this case, the connecting rod big end A, which is also integral with the connecting rodlF,.may be wider than the roller K, This ai rangement prevents the roller from coming into contact with the split collars G and avoidsriskof them catchin up such co lar.

invention to a connecting rod big end, and in this'case the connecting rod is split diametrically, whereby. only one half of the big end bearing A is integral'with the shank F of-the connecting rod, the other half A or jamming against the split in Fig. 7 shows a; further adaptation of m a being in the form of a .cap. The outer track of the rollers, however, is a one piece .ring E, and may be completely hardened,

while the flanges B on the big end may be hardened in any desired parts as already described. In this figure, the half of the bearing which is integral withthe connecting rod is shown in section, and the cap A is shown in full. q is an oil hole communicating to'the rollers K, and: any suitable number of these holes may be-drilled, or alternativelyholes may be drilled in the crank web J and asuitable hole 7' with a cup j may be drilled leading from 7" to the rollers,

so that as the crank rotates, oil is flung;

into thecup 7', travels up the passagej and finds it) way out of the bearing through the sides of the connecting rod end A, which has, of course, sufficient clearance to be a with the rollersK. The connecting flange C on the outside is situated about the center of the rollers for the purpose of concentrating theload" moreon the center of each roller than onthe ends, in order to prevent the rollers from chipping on their corne'i's.

This outer race A may be spigo'ted in the aluminium or other metal portion either by the spigoteor at any other suitable part. d is a recess and b a chamfered edge, as in III.

Figs. 1 and 2. The connecting or. carrying flange G in Figs. 1, 2, 3, 4 and 8 maybe either circular or square or any other desired sh'ape,,or may be formed into small lugs or bosses where extreme lightness is desired, but it is generally preferable to maintain the section of the races constant in.

order to prevent uneven springing or give in these. races when the "bearing is under heavy load, which spring, or give would cause the track of the outer race to become distorted from its true circular shape.

Another method of applying'this bearing is shown in Fig. 9 wherein the outer race A is integral with a gear wheel M in which the teeth may be left soft or hardened. as desired, and one or more 'ball or roller races may be used to carry this wheel. The outer race forms the boss A, having one or more bearings k and Z. These bearings may be of different diameter, if desired, such as in the case of overhung shafting, and a hardened washer N may be screwed or otherwise attached to one end of the shaft L for the purpose of holding the rollers K in position. The web m may be left soft, as hereinbefore described.

I do not confine my invention to outer races alone, but may apply it to the inner race also, and Fig. 10 shows an application of this as an example. P is the inner race. which may be hardened on the surfaces p, and integral with this race is carried the flange Q, which may be left soft as previously described, and drilled for rivets R, or screws or bolts may be fitted. The example shown in Fig. 10 is an application to the main bearings. of a crankshaft, and this permits the inner race P to be threaded over the crank throws J, and bolted or riveted rigidly in position. -To facilitate this, the shoulders S are turned on their outside concentric tothe center line ofthe crankshaft, and are chamfered away on the corners s in order to enable the races P to be threaded into position.

The flange C is shown in the center of as previously spring underheavy shock thetraclr' of-ithe rollers in Figs. 1, and 8,.

suchpositionre'duding the liability-of the rollers to become chipped on their corners not bind myself to the fitting of this flange in any particular position. Thus, the races may be used as shown irfFig. 11 with the flange C at one end of the race. This type of race is sometimes useful when it has to carry a gear wheel on shaft T or other heavily stressed part, as the flange O can be light in section and allow a small amount of j Any ofthe outer-racesshown in Figs. 1, 2, 3, 4, 8 and 9 can be reversed and adapted for inner races, and it should be noted that these adaptations of this invention are only as illustrations, and that the races may be built up in numerous different shapes. If the races are fitted with balls instead of rollers, the tracks should be curved accordingly.

I claim 1. In an anti-friction bearing, a bearing ring having a hardened race way and an unhardened flange forattachment; to a .supporting part.

2.- In an anti-friction bearing, a bearing ring having a race Way and a flange, the

described. Nevertheless, I do bearing surfaces of the ring and flange being hardened and an unh'ardened flange for attaching the race way to a support.

' GRANVILLE EASTWOOD BRADSHAW.

. Witnesses: 1 T. A. DENNIL, G. L. BRIDGES. 

